NTSTATUS
NTAPI
FatLockControl(PDEVICE_OBJECT DeviceObject, PIRP Irp)
{
PFAT_IRP_CONTEXT IrpContext;
NTSTATUS Status;
BOOLEAN TopLevel;
DPRINT1("FatLockControl()\n");
/* Enter FsRtl critical region */
FsRtlEnterFileSystem();
/* Set Top Level IRP if not set */
TopLevel = FatIsTopLevelIrp(Irp);
/* Build an irp context */
IrpContext = FatBuildIrpContext(Irp, IoIsOperationSynchronous(Irp));
/* Call internal function */
Status = FatiLockControl(IrpContext, Irp);
/* Reset Top Level IRP */
if (TopLevel) IoSetTopLevelIrp(NULL);
/* Leave FsRtl critical region */
FsRtlExitFileSystem();
return Status;
}
NTSTATUS
NTAPI
FatRead(PDEVICE_OBJECT DeviceObject, PIRP Irp)
{
NTSTATUS Status;
BOOLEAN TopLevel, CanWait;
PFAT_IRP_CONTEXT IrpContext;
CanWait = TRUE;
TopLevel = FALSE;
Status = STATUS_INVALID_DEVICE_REQUEST;
/* Get CanWait flag */
if (IoGetCurrentIrpStackLocation(Irp)->FileObject != NULL)
CanWait = IoIsOperationSynchronous(Irp);
/* Enter FsRtl critical region */
FsRtlEnterFileSystem();
if (DeviceObject != FatGlobalData.DiskDeviceObject)
{
/* Set Top Level IRP if not set */
TopLevel = FatIsTopLevelIrp(Irp);
/* Build an irp context */
IrpContext = FatBuildIrpContext(Irp, CanWait);
/* Perform the actual read */
Status = FatiRead(IrpContext);
/* Restore top level Irp */
if (TopLevel)
IoSetTopLevelIrp(NULL);
}
/* Leave FsRtl critical region */
FsRtlExitFileSystem();
return Status;
}